A pragmatic design methodology using proper isolation and doping for bulk FinFETs

• This paper presents a pragmatic device design methodology for bulk FinFET.
• The pragmatic design could be controlled by isolation oxide and substrate doping levels.
• The design methodology can be applied to low power and high speed applications within a design window.

A feasible device design methodology for bulk FinFETs is proposed. An optimal yet simple process technique is shown to achieve good performance while maintaining low leakage current with thin gate-to-substrate isolation oxide and moderately doped substrate. In contrast, high substrate doping underneath the fin and thick isolation oxide are usually needed to prevent substrate leakage in conventional bulk FinFETs. A design window accounting for isolation oxide thickness and substrate doping level is proposed for low power and high performance application. Sufficient substrate doping (in the mid-1018 cm−3 range) and proper isolation oxide of 10s nm are suggested based on our performance projection.

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